SAP Message AFWGO_MESSAGES808 - You cannot change single records procedure &1 on &2

Diagnosis
You can no longer change single records procedure &V1& as at date &V2&.The most recent version has been available since &V3&. You have eithertried to change an old version of the single records procedure, orcalculated data exists that is more recent than &V2&.

System Response
Changes to the single records procedure are no longer permitted.